Publications by authors named "Jon Davids"

Background: Toe walking is prevalent among children, affecting 5% to 24% of the pediatric population. Clinicians rely on parental reports of frequency of toe walking to guide clinical decision making and outcomes assessment. However, recall accuracy and differing environments challenge the reliability of parental reports.

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Background: In the absence of 3-dimensional gait analysis (3DGA), assessment of transverse plane motion of the lower extremity from sagittal and coronal video has a high degree of error. We propose a standardized method through vertical video-based gait analysis (VVGA) to assess the position of the pelvis and lower extremity in the transversal plane. This study aims to evaluate the reliability and accuracy of VVGA compared with 3DGA for transverse plane kinematics.

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Article Synopsis
  • Children with cerebral palsy often experience foot deformities, which require precise evaluation for effective treatment and monitoring.
  • This study tested the reliability of a new photo-based assessment tool called the Modified Foot Posture Index (MFPI) among 13 orthopedic surgeons evaluating foot photographs of 20 children with CP.
  • Results indicated that the MFPI exhibits excellent reliability in measuring foot deformities, making it a noninvasive and practical option for clinical and research settings.
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  • Cerebral palsy (CP) is linked to upper motoneuron disorders that disrupt muscle function due to issues in the developing brain, causing muscle stiffness and changes in extracellular matrix (ECM) architecture.
  • A study collected muscle biopsies from children with CP and typically developing (TD) individuals to analyze how muscle and ECM changes affect stiffness, gait, and joint function.
  • Results showed that while muscle mechanics were similar between TD and CP, stiffness and collagen properties in CP hamstrings correlated with reduced knee motion, indicating that ECM properties may change significantly during muscle stretching in CP.
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Aim: To evaluate the mechanosensitivity of muscle satellite cells (MuSCs) and fibro-adipogenic progenitors (FAPs) in cerebral palsy (CP) and the efficacy of the drug verteporfin in restoring cells' regenerative capacity.

Method: Muscle biopsies were collected from six children with CP and six typically developing children. MuSCs and FAPs were isolated and plated on collagen-coated polyacrylamide gels at stiffnesses of 0.

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Gait for individuals with movement disorders varies widely and the variability makes it difficult to assess outcomes of surgical and therapeutic interventions. Although specific joints can be assessed by fewer individual measures, gait depends on multiple parameters making an overall assessment metric difficult to determine. A holistic, summary measure can permit a standard comparison of progress throughout treatments and interventions, and permit more straightforward comparison across varied subjects.

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Posttraumatic cubitus varus is a multiplanar deformity that results from an improperly reduced supracondylar humerus fracture. The prevention of posttraumatic cubitus varus hinges on the stable restoration of all 3 columns of the distal humerus while avoiding malrotation. The collapse of any column leads to varying degrees of deformity in the coronal, sagittal, and/or axial plane.

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Motivation: Methods for concept recognition (CR) in clinical texts have largely been tested on abstracts or articles from the medical literature. However, texts from electronic health records (EHRs) frequently contain spelling errors, abbreviations, and other nonstandard ways of representing clinical concepts.

Results: Here, we present a method inspired by the BLAST algorithm for biosequence alignment that screens texts for potential matches on the basis of matching k-mer counts and scores candidates based on conformance to typical patterns of spelling errors derived from 2.

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The Human Phenotype Ontology (HPO) is a widely used resource that comprehensively organizes and defines the phenotypic features of human disease, enabling computational inference and supporting genomic and phenotypic analyses through semantic similarity and machine learning algorithms. The HPO has widespread applications in clinical diagnostics and translational research, including genomic diagnostics, gene-disease discovery, and cohort analytics. In recent years, groups around the world have developed translations of the HPO from English to other languages, and the HPO browser has been internationalized, allowing users to view HPO term labels and in many cases synonyms and definitions in ten languages in addition to English.

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We identified a de novo heterozygous transient receptor potential cation channel subfamily M (melastatin) member 3 () missense variant, p.(Asn1126Asp), in a patient with developmental delay and manifestations of cerebral palsy (CP) using phenotype-driven prioritization analysis of whole-genome sequencing data with Exomiser. The variant is localized in the functionally important ion transport domain of the TRPM3 protein and predicted to impact the protein structure.

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Aim: To assess the accuracy, reliability, and discriminatory ability of a mobile app for measurement of migration percentage in hip surveillance radiographs of children with cerebral palsy (CP).

Method: The free mobile app HipScreen (www.hipscreen.

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Background: Tendo Achilles lengthening (TAL) for the management of equinus contractures in ambulatory children with cerebral palsy (CP) is generally not recommended due to concerns of over-lengthening, resulting in weakness and plantar flexor insufficiency. However, in some cases, surgical correction of severe equinus deformities can only be achieved by TAL. The goal of this study is to assess the outcomes following TAL in these cases.

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Purpose: In children with cerebral palsy, flexion deformities of the knee can be treated with a distal femoral extension osteotomy combined with either patellar tendon advancement or patellar tendon shortening. The purpose of this study was to establish a consensus through expert orthopedic opinion, using a modified Delphi process to describe the surgical indications for distal femoral extension osteotomy and patellar tendon advancement/patellar tendon shortening. A literature review was also conducted to summarize the recent literature on distal femoral extension osteotomy and patellar tendon shortening/patellar tendon advancement.

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Background: Gait classification systems (GCS) may enable clinicians to differentiate gait patterns into clinically significant categories that assist in clinical decision-making and assessment of outcomes. Davids and Bagley in 2014 [1] described a GCS for children with cerebral palsy (GCS-CP). The purpose of our study was to use the GCS-CP for the first time on a sample of patients with CP and to evaluate the reliability and utility of the classification system.

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Toe walking is a common presenting report to an orthopaedic practice. Evaluation of a child with toe walking includes a thorough history and physical examination to elucidate the diagnosis. When no other diagnosis is suspected, a diagnosis of idiopathic toe walking is often given.

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Purpose: The purpose of this study was to establish consensus for the assessment of foot alignment and function in ambulatory children with cerebral palsy, using expert surgeon's opinion through a modified Delphi technique.

Methods: The panel used a five-level Likert-type scale to record agreement or disagreement with 33 statements regarding the assessment of foot alignment and function. Consensus was defined as at least 80% of responses being in the highest or lowest of two of the five Likert-type ratings.

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Purpose: The purpose of this study was to develop consensus for the surgical indications of anterior distal femur hemiepiphysiodesis in children with cerebral palsy using expert surgeon opinion through a modified Delphi technique.

Methods: The panel used a 5-level Likert-type scale to record agreement or disagreement with 27 statements regarding anterior distal femur hemiepiphysiodesis. Consensus was defined as at least 80% of responses being in the highest or lowest 2 of the Likert-type ratings.

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Purpose: There is marked variation in indications and techniques for hamstring surgery in children with cerebral palsy. There is particular uncertainty regarding the indications for hamstring transfer compared to traditional hamstring lengthening. The purpose of this study was for an international panel of experts to use the Delphi method to establish consensus indications for hamstring surgery in ambulatory children with cerebral palsy.

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Article Synopsis
  • * Twelve children were involved, using different methods of neuraxial anesthesia, with their pain levels and opioid usage monitored.
  • * Results showed effective pain control with minimal complications, indicating that neuraxial anesthesia is a viable option for these patients, especially using the ITB pump’s side port for opioid delivery when other methods are unsuitable.
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Introduction/objectives: The aim of this study was to investigate the validity and reliability of "Shriners Hospital for Children Upper Extremity Evaluation (SHUEE)" for children with rheumatic diseases.

Methods: The study was carried out after obtaining the necessary permissions and retrospectively registered. The psychometric properties evaluated were reliability and concurrent validity.

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Purpose: The purpose of this study was for an international panel of experts to establish consensus indications for distal rectus femoris surgery in children with cerebral palsy (CP) using a modified Delphi method.

Methods: The panel used a five-level Likert scale to record agreement or disagreement with 33 statements regarding distal rectus femoris surgery. The panel responded to statements regarding general characteristics, clinical indications, computerized gait data, intraoperative techniques and outcome measures.

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Background: Crouch gait is a frequent gait abnormality observed in children with cerebral palsy. Distal femoral extension osteotomy (DFEO) with the tightening of the extensor mechanism is a common treatment strategy to address the pathologic knee flexion contracture and patella alta. The goal of this study was to review the results of a patellar tendon imbrication (PTI) strategy to address quadriceps insufficiency in the setting of children undergoing DFEO.

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Article Synopsis
  • Idiopathic toe walking (ITW) is a condition where children walk on their toes, and this study focused on surgical outcomes for patients with severe ITW who didn't respond to conservative treatments.
  • The research included 26 patients who underwent surgical procedures (Zone II or Zone III lengthening) and assessed their progress over a year through clinical and motion analysis.
  • Results showed that 100% of patients who had Zone III lengthening improved, while 88% of those who had Zone II lengthening did as well, indicating that surgical intervention can be effective in severe cases of ITW.
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Purpose: Equinus is the most common deformity in cerebral palsy (CP) and gastrocsoleus lengthening (GSL) is the most commonly performed surgery to improve gait and function in ambulatory children with CP. Substantial variation exists in the indications for GSL and surgical technique. The purpose of this study was to review surgical anatomy and biomechanics of the gastrocsoleus and to utilize expert orthopaedic opinion through a Delphi technique to establish consensus for surgical indications for GSL in ambulatory children with CP.

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